local modem = peripheral.find("modem", rednet.open);

local idFilename = "id.lua"

local protocol = "Potion_Brewer_SCANNER"
local logging = "Potion_Brewer_LOGGER"

local id = ""

function log(string)
    print(string)
    rednet.broadcast("[SCANNER_"..id.."] "..string, logging)
end

function init()

    -- get this selectors id
    local idFile = fs.open(idFilename, "r")
    if idFile then
        id = idFile.readAll()
        idFile.close()
    else
        log("failed to open id file: "..idFilename)
    end

    log("ID file loaded, this selector is: "..id)

    rednet.host(protocol, id)

    --wait for an event to dispense the item
    while true do
        -- wait for a redstone event
        os.pullEvent("redstone")
        if rs.getInput("back") then
            -- send scanner event
            log("signal detected. broadcasting.")
            rednet.broadcast("EVENT_SCANNER_"..id, protocol)
        end
    end
end

init()